216542061 has 12 divisors (see below), whose sum is σ = 312947388. Its totient is φ = 144285504.

The previous prime is 216541981. The next prime is 216542089. The reversal of 216542061 is 160245612.

216542061 is a `hidden beast` number, since 2 + 1 + 654 + 2 + 0 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81540900 + 135001161 = 9030^2 + 11619^2 .

It is not a de Polignac number, because 216542061 - 2⁷ = 216541933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216542761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15841 + ... + 26153.

It is an arithmetic number, because the mean of its divisors is an integer number (26078949).

Almost surely, 2^216542061 is an apocalyptic number.

It is an amenable number.

216542061 is a deficient number, since it is larger than the sum of its proper divisors (96405327).

216542061 is a wasteful number, since it uses less digits than its factorization.

216542061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12652 (or 12649 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 216542061 is about 14715.3681911123. The cubic root of 216542061 is about 600.5014890644.

Adding to 216542061 its reverse (160245612), we get a palindrome (376787673).

The spelling of 216542061 in words is "two hundred sixteen million, five hundred forty-two thousand, sixty-one".